Wearable device having flexible battery

Abstract

Provided is a wearable device having a flexible battery, and the wearable device includes: a functional unit; a band unit that fixes the functional unit to a wrist of a user; and a thin plate flexible battery that is embedded in the band unit and supplies power to the functional unit.

The invention claimed is: 
     
       1. A wearable device having a flexible battery, the wearable device comprising:
 a functional unit; 
 a band unit that fixes the functional unit to a wrist of a user; and 
 a thin plate flexible battery that is embedded in the band unit and supplies power to the functional unit, 
 wherein the thin plate flexible battery comprises: an electrode assembly; an electrolyte; and a packaging member that seals the electrode assembly and the electrolyte, and wherein the packaging member is configured by sequentially laminating a heat-sealable layer and a protective layer outwardly from an inner side of the packaging member, 
 wherein the electrode assembly comprises: 
 a positive electrode including a first porous nanofiber web having a plurality of first pores, the first porous nanofiber web being formed of first nanofibers which are made of electrospun and accumulated polymer material, first metal particles coated on the first nanofibers to form the first nanofibers as a first conductive support, a positive electrode active material slurry injected into the plurality of first pores, a first conductive adhesive layer formed on the first porous nanofiber web, and a first conductive metal layer formed on the first conductive adhesive layer; 
 a negative electrode including a second porous nanofiber web having a plurality of second pores, the second porous nanofiber web being formed of second nanofibers which are made of electrospun and accumulated polymer material, second metal particles coated on the second nanofibers to form the second nanofibers as a second conductive support, a negative electrode active material slurry injected into the plurality of second pores, a second conductive adhesive layer formed on the second porous nanofiber web, and a second conductive metal layer formed on the second conductive adhesive layer; and 
 a porous separator for separating the positive electrode and the negative electrode, 
 wherein the first nanofibers and the second nanofibers have a diameter of 0.3 to 1.5 μm, and the first porous nanofiber web and the second porous nanofiber web have a thickness of 5 to 1000 μm, and 
 wherein the separator comprises: 
 a porous nonwoven fabric playing a role of a support; and 
 a porous polymer web layer or a non-pore polymer film layer that is laminated on one side of the porous nonwoven fabric and playing a role of an adhesive layer and an ion moisture-containing layer when the porous polymer web layer or the non-pore polymer film layer is in close contact with the positive electrode or the negative electrode facing the porous polymer web layer or the non-pore polymer film layer. 
 
     
     
       2. The wearable device having a flexible battery of  claim 1 , wherein the packaging member further comprises a strength reinforcing layer bonded to the protective layer under adhesion of the adhesive layer. 
     
     
       3. The wearable device having a flexible battery of  claim 2 , wherein the strength reinforcing layer is PET. 
     
     
       4. The wearable device having a flexible battery of  claim 1 , wherein the protective layer is one of PTFE (polytetrafluororthylene), nylon, PP (polypropylene), PET (polyethylene terephthalate), PVDC (polyvinylidene chloride), PE (polyethylene), PVC (polyvinyl chloride), and EVOH (ethylene vinyl alcohol). 
     
     
       5. The wearable device having a flexible battery of  claim 1 , wherein the heat-sealable layer is a single layer structure of one of CPP (casting polypropylene), LLDPE (linear low density polyethylene), LDPE (low density polyethylene), HDPE (high density polyethylene), polyethylene, polyethylene terephthalate, polypropylene, EVA (ethylene vinyl acetate), an epoxy resin, and a phenol resin, or a laminate structure thereof. 
     
     
       6. The wearable device having a flexible battery of  claim 1 , wherein the flexible battery is insert molded and built in the band unit. 
     
     
       7. The wearable device having a flexible battery of  claim 1 , wherein the functional unit is a smart watch that performs a camera function, a voice command and memo function, a music function, a clock function, and functions such as texts and phone calls, in connection with a smart phone. 
     
     
       8. The wearable device having a flexible battery of  claim 1 , wherein a main battery is mounted in the functional unit, and the flexible battery is configured to be used as a secondary battery to charge the main battery. 
     
     
       9. The wearable device having a flexible battery of  claim 1 , wherein a positive terminal and a negative terminal of the flexible battery are protruded as male terminals at an end of the band unit, and female terminals to be coupled to the male terminals are formed in the functional unit. 
     
     
       10. The wearable device having a flexible battery of  claim 1 , further comprising: a connector that is connected to a positive terminal and a negative terminal of the flexible battery, and that is projected into one end of the band unit; and a socket into which the connector is inserted and which is formed in the functional unit to be electrically connected with the connector. 
     
     
       11. The wearable device having a flexible battery of  claim 10 , wherein the connector is used as a charging terminal for charging the flexible battery. 
     
     
       12. The wearable device having a flexible battery of  claim 1 , further comprising: a connector that is connected to a positive terminal and a negative terminal of the flexible battery, and that is projected into one of the band unit in which the other end of the band unit is fixed to one end of the functional unit; and a socket into which the connector is inserted and which is formed in the functional unit to be electrically connected with the connector. 
     
     
       13. The wearable device having a flexible battery of  claim 1 , wherein a wireless power receiving antenna device is mounted in the flexible battery or the band unit in order to charge the flexible battery in a wireless charging method. 
     
     
       14. The wearable device having a flexible battery of  claim 1 , wherein the electrolyte is a gel polymer electrolyte or a solid electrolyte that is formed by impregnating an organic electrolyte solution into the separator, in which the organic electrolyte solution is formed by mixing a gel polymer forming monomer and a polymerization initiator, and synthesizing a gel-type gel polymer by polymerization of a monomer through a gelation heat-treatment process. 
     
     
       15. The wearable device having a flexible battery of  claim 1 , wherein the positive electrode active material slurry or the negative electrode active material slurry comprises PTFE (polytetrafluoroethylene). 
     
     
       16. The wearable device having a flexible battery of  claim 1 , wherein a recess for detachably fixing the functional unit is formed in the band unit. 
     
     
       17. The wearable device having a flexible battery of  claim 16 , wherein the functional unit may be attached to and detached from the recess in an up-and-down (or vertical) direction or in a sliding manner.